function words_deal(num,txt_ara,number) {			    
			var nMax = num;			    
			var textDom =  document.getElementById(txt_ara);			    
			var len = textDom.value.length;  			    
			if(len > nMax) {				      
				textDom.value = textDom.value.substring(0, nMax);	      
				return;				    
			}			    
			document.getElementById(number).innerHTML = nMax-len;	  
		}